DOOM ENGINE CRASH ON STARTUP CODE

merged texture and flat browser source code to reduce code duplication (this shouldn't have any effects that are noticeable to you, but please, keep an eye for new bugs with the texture browser)

fixed a minor bug with displaying texture counts in the browser moved 'Grid Increase' / 'Grid Decrease' to be beside each other in the hotkey setup added tooltips for thing/linedef flags in the edit windows drag/dropping a wad file on main window when nothing is open, now opens that wad if you hold alt when you start to drag things, it duplicates them instead. when drag-selecting, hold alt when you release-click to drag-deselect instead texture categories remember which one you clicked on properly texture categories for subfolders/subwads inside pk3 resource archives there is an option in preferences to revert to the old behavior: 'Put 'All' and resource categories on top in browsers' All / Textures / Flats / resources categories are on top in the texture browser now. Better support for Visplane Explorer, Tag Range, Stair Builder, Sound Propagation, and Automap plugins new Lua plugin (thanks to Ribbiks, Grain of Salt, Printz, MTrop, and Xaser for feedback) fixed a visual bug with vertex edit form not updating UDMF custom properties correctly. fixed issue with sectors being deleted in the middle of merging newly drawn geometry, causing a crash fixed some various config issues (thanks to Altazimuth and Printz) added EE heretic UDMF config (thanks to Altazimuth and Printz) fixed null pointer exception in 3D mode when changing sidedef (thanks to Davidmerkt.) bumped sharpcompress version to 0.29 in order to fix security advisory

Doom engine crash on startup